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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7690d2c1ec13a48acce7a400fd2a0f87a40b590893ca2458fdddff91e4b77f01' 
  AND token = '2RpUe9JpWNEYj2WOsDu9fGrAqixACbUnDHto7zoGn3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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