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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72ca04b80a297e85eb8c9288776a2bd919f158f36cf899aadb134c01cbd7db9' 
  AND token = 'B7OoL00GDSw0lq3x3AmJuRO4vztY52hWerzOWvoDchI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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