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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7bb4a2d74c814ddbbb9b545dd4e52cd8d616366034cd507f0b3e318cbfc5ef' 
  AND token = 'zt1zXMLHvzy7jNwJ8J5kmz9LMUCOy31b77aFz0zKn4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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