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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd008bc579e4cacedacae90c9b1a47568f5b8c9098e5774c3f3efad944707729' 
  AND token = 's7hV25kJM62Fbu1bdFmUK6DMf8AGPaqP6v1FP0ivhF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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