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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c7e18696e1ead3c45046d2cff95b6253762d1456fc0fbc8c99f34107aa14f1' 
  AND token = '/9oMGBqBrDdLvnwD8jKvtpZiwrJ0rEocDI7A/ytwabA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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