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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2704b24e715b2eb50bc5656501d974f15d11f0b6bc6d487e1c7a2d43df73c5' 
  AND token = '3tYzqf2Ctoxfm6IIvb8+ug2kzuYQqMC1bl/C3jsnrIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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