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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc22c9f4b2c93aad8a3fed18100b4109228dec683267e39ff9a3f03d1a5aa2d' 
  AND token = '9An70JMWae1+KkfbPQF0b3TPoekjPsP0O67PrmRk3kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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