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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9f9b16b4b3c001435610bf23e0eddfed389d95550df53445240a02657043fa' 
  AND token = '+CLCxCy87JcGEa9ObSv7/hR+0WHa1O2gUwjnyaQilPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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