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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb68716810e19e193ac6753b1b95699701b24e3532f794e86a19e353e64a2841' 
  AND token = 'ijOKY7vOWdExkzGMmzRbCkSKUgJ7kjnygv89uMjpczc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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