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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0305c6ba5eaca9e5a663471e91c697e2982c443436e794dfb196cebeaa604fa4' 
  AND token = 'AsUdEQ/17bSY8rszgIGjOfotGn7T/rTMS2J8tdfoNEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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