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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3fa6b0a85f1643472cd84cf66df02c6630ab95fb79cf063f83838deff5d426' 
  AND token = '7Ab5p9xvCEOO93Kdss76eu2FlXJk6R9a+pAx3J3x0Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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