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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371be077ccd77cb822a9b953740579e32e9a128e0ff7d4586a3275342bb890d1' 
  AND token = 'W/OCYrMEE5G3j5Tps6cCb1bAvGxO8sePBRxcZBNOn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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