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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f26ecf177e7e9534890ed68a04eced4a8c5fecc2b25d0772471e51ee519f39d' 
  AND token = 'NWdvmRweesB/dAYWJqmdzR9f/UN/sC48X8DfxG36Xmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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