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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a26ae364119151fdc2d94a5a7f6f60edac1ca7aac9ca2e1277fd6307da14e0' 
  AND token = 'bTs+9S1NhwopDMwcb8U+s3VQFYHYTX3hvUqw3Rvu9e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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