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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb610c8ec3d741ff10fad69eb187a6d0bb684f44c552800b084cfdedd52dcd9b' 
  AND token = 'M3N02IJ1lBC3FlPOEI/r1Zh8ufH18s7T5Q8NHUmsDDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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