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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70710666974afc20de542b8ba1d7131e79a209aeaebddbb2a9bf3539f841b1a0' 
  AND token = 'kXV4bGQinFSnZhRTEMJWL1qFv9roXDhjcTAtRTCX5Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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