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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82750114a4ec8e233b0df3f8273cd5cfd1412ba86bc5c0bf82eff0ede71cb78' 
  AND token = 'IJtJIQb8bqe8URNhXv5bs1akYhAUekOkWI1Hzo09csI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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