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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919859cec2c619577d52c5322570a0467b28749fcc068d347713a8fd0ba4c76e' 
  AND token = 'uhJ11mU1ity/nksIekOfK4jeDTlPKmhTL2XUj+xZXUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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