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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c159d5dde74059a72574aa610487f459fa1c89dda9b1ef4026b771805e3d72' 
  AND token = 'JAm6b99Wk2EOkvD2oE38NT2ry+0EO5pV+6NewffgY0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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