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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16b18fc48dae0ea4d68f66885458102a959269dddf77b4554091b2d567871a9' 
  AND token = '62a/gzW5rODIj1q6lw8ACc3KT3WMOeCsEao1vBQ/NVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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