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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac910d5481fc37d97d59248b8219bd8e04011bbee51f9173e8593f32a22c716f' 
  AND token = 'ukbJYSWAYRYc50yknzPURpRSrMZ1nf9OTIGtiNwveEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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