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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0b5c511f7f97b019a95e171063010fb23db33e3eb508ef63ef2bc5ee492c0f' 
  AND token = 'RVMMbtSJUE4tm4q1WFqaOOQQ5ELY1vNe1YhnRdXgOaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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