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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805263b8aaa2cbca406da89e44923cbf3a65313c85e81d90604bf84756cf0030' 
  AND token = 'F03TX9b+VLPw/mtgrZdvmsBCaj/bd634RTqBHWx/n5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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