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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b523142b264f741a1ef5c1414423e0eca9de0189e666f263a19f478116b4a9d1' 
  AND token = 'jLfT/J4U6SNkCX+3+ORsfZLzs1/nzcVtvQbS8LAhHB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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