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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b286fc99f9fa9933abe66a00f5cd8c5e86c0411088c1876d0fd90de41f6181ad' 
  AND token = 'SDMzcSNlBuk5VvOmN7X8Ghh63BYmpid78I8Nki6ohXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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