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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84e09ad4987b82fb64af01e3f96917b27fb56886489547a0b041d822ff40f0e' 
  AND token = 'HxG15AxBn7nihxTqegSb6EHKNIycVVUAKFIQdqAFrig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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