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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6da404a409ea3c55c02c29039b2722c9a8f81eefad9a44d328680212d15f0a4' 
  AND token = 'W7Zz33RVZULBBtdOB//i+OffmFeCboMK7e6o2VLbMsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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