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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c402284df015443243ea04b5f743cc714fcac0280e840a8a69685b0b2062e8' 
  AND token = 'jeYxwLveGfYhTbw71+btQqGUhRwTwTEy1r42GPHr0Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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