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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd7ddb62ec14cd0b505918c5fe9e90afa1eafcb6debb130fc1d99d8c48e6a0f' 
  AND token = 'OvFLmoywL8nPGCN+fHX9SMrRb5BaC5g4k9ngPu3RCRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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