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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7410752f5668a35cc079599afe3bd7ebce2d2ba06a9f8fc349c1705955c459b' 
  AND token = '1N+rUzYLUxrhcpIfq4gEO38dWSYJ4Azg8Z1X7wMw2Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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