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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa76e5558bd504114f8152f33dc74dab756b1e0eef2d6ec9fc767475eae2b29' 
  AND token = 'O2D5r/gpTPjNatksV4UbRztaG/RKVvWxV0/K7boamfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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