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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8c6cc232321b8075b9f5492b048da77e802b0f15f24f2c87aaa61b95b8b54b' 
  AND token = 'iJ6oBXILEq6C56zFgjEGWBtoycUxU4j4vOZQ8Mia9UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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