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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed701efcb40e2f40efba65025affb0dd06631fbc09e34fb813eec50b980ab1a5' 
  AND token = 'e2ohG6CiWMZAknNt65andB3+id+oJaZZy4Gnzyvku10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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