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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a56f45df99e4facaaa9f22f76307777082d5f35ee01faee4f2712324339b420' 
  AND token = 'y73mxRmg9WoSWnbUf0ZwYi0KHxSig7IFTYqJxy5w0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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