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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6303a715f213c78f6be20fb69c5eef58dcbad3b4cc2a69310b846264d3911bd3' 
  AND token = 'nU58Dq2XGpR9zOE4A7G+81LqRLRREyNV7Pjwpws+erM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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