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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139555b35dd0e50f853ec37e4668fd7625c45edf73a4389214b98a5975d00be6' 
  AND token = 'DnDCplAtY0vKy6IRFz/HMsHu3egbaK92D/OHEuoD+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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