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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1910d16b0eff82ce288c48d0a11c73323c856b210f0a2262972f0582015770ab' 
  AND token = 'KT9R9NkJqmKKV6eaAMPRAjQLwg75rrqLQ3Vv7Rna5Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}