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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bbb8a6d4aca7abc367f67556fa067d76a9d83936d61712dad9fd679b577dba' 
  AND token = 'ctsu2YinbQd8PpOMg8+Oo8ug02JkD20y2WTkx85tlBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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