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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074942104b0b75393f998d88394c8f74164b5c55387fc2cb3889068d010690f2' 
  AND token = 'btfMVz3tAqG4aVOyDLDqP5D3Zfns0fn+2oRT5JFVjb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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