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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c86f5e3a8ec74456a33d2397a73eb94857f831a2934843df3ba65bd6f19dc29' 
  AND token = 'Bosxm2MMb/t/aazVlXOzysXM0iVrn51tDSX2luCy5co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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