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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c64eb80d0d57ed46d4ff154778f43df64df824e96861997777c74d8d35a9ce' 
  AND token = 'Dp1JVR04L8AJUf3Wn47JrriRcFBx86yrC27r5ud8kD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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