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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374a948303d60e47b8c808c0292b09e5926355186c42955d039ab85657629cd4' 
  AND token = '26NWdE4oE5NmVr8yk7tCFb2Qn41qlqR45bslHsW5yBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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